# Check my math - electric cars and the grid

Discussion in 'Basic Math' started by UmYeah, May 20, 2022.

1. ### UmYeah

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I set out for a rough number on how much electricity the USA needs for a 100% electric cars.

The answer is a little shocking and hard to believe, it's basic math, with huge numbers and kW's, if there's a mistake, I don't see it.

My input numbers are what I found "on the web" and are in the ballpark of the range I found in my searches.

Is there an error here?

Average 1 month total electricity generation in the USA:
4.1TerraWatts / 12 = 342,000,000kW

Average 1 month total miles driven in the USA:
3.3 Trillion / 12 = 275,000,000,000

Average kilowatts to move an electric vehicle 1 mile:
0.346kW

Total kW needed for 1 month of electric vehicle travel:
95,150,000,000kW

Assume 0% currently goes to charge EV's
342,000,000kW is currently generated/used each month

95,150,000,000kW additional is needed to charge EV's

In total, we need to generate 95,492,000,000kW each month.
We currently generate 342,000,000kW

We need to increase generating/delivery capacity by 27,822%

Current capacity x 279 = enough kW to power a 100% EV America?

UmYeah, May 20, 2022

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